If faces from an imported part do not appear to have been formed correctly, you can replace the face with a new face generated by ABAQUS/CAE based on the underlying geometry. Because ABAQUS/CAE relies on the underlying geometry, you should not use the Replace face tool if the resulting face would be very convex. If you select more than one face to replace, the faces must be connected.
Alternatively, you can replace a face by extending neighboring faces. This tool is useful for removing bosses or small bumps from your parts.
To replace faces:
From the main menu bar, select Tools
Repair.
ABAQUS/CAE displays the Geometry Repair Tools dialog box.
Tip:
You can also replace faces using the 
tool, located with the repair tools in the Part module toolbox. For a diagram of the repair tools in the toolbox, see “An overview of repair techniques,” Section 47.2.
From the dialog box, select Replace faces and click OK.
Select the faces that you want to replace. The faces must be connected. You can select the faces from the viewport or click mouse button 3 paste them into your selection from a temporary selection group.
You can use a combination of drag select, [Shift]+Click, [Ctrl]+Click, and the angle method to select more than one face to replace. For more information, see “Selecting objects within the current viewport,” Section 6.2.
Tip:
If you are unable to select the desired faces, you can change the selection behavior by clicking the selection options tool 
in the prompt area. For more information, see “Using the selection options,” Section 6.3.
From the prompt area, toggle on Extend neighboring faces to replace the selected faces with a single face that is formed by extending neighboring faces.
Click mouse button 2 to indicate that you have finished selecting faces.
ABAQUS/CAE replaces the selected faces with a single face.
If you have finished repairing the part, you should check its validity by clicking mouse button 3 on the part in the Model Tree and selecting Update validity from the menu that appears.
